Jamb Biology Questions - Heredity
Question 16:
The ratio of carriers to sicklers in the F1 generation derived from a parental cross of two carriers of haemoglobin S gene is
- A 3 : 1
- B 1 : 3
- C 2 : 1
- D 1 : 2
Question 17:
when the two alleles present in an organism are of the same type, the genotype is described as
- A Heterozygous
- B Heterogamous
- C Homozygous
- D Homologous
Question 18:
Which of the following is a sex-linked character?
- A Sickle-cell anaemia
- B Tongue rollling
- C Skin colour
- D Colour blindness
Question 19:
What will be the result of the first filial generation (F1) and the second filial generation (F2) of a mono-hybrid cross between pure line normal-winged Drosophilia flies and pure line short-winged flies, if the gene for the normal wing is dominant?
- A F<sub style='font-size: smaller;'>1</sub> flies all short-winged and F<sub style='font-size: smaller;'>2</sub> flies all normal-winged
- B F<sub style='font-size: smaller;'>1</sub> flies all normal and F<sub style='font-size: smaller;'>2</sub> flies all short-winged
- C F<sub style='font-size: smaller;'>1</sub> flies all short-winged and three-quarters of F<sub style='font-size: smaller;'>2</sub> flies are short-winged
- D F<sub style='font-size: smaller;'>1</sub> flies all normal-winged and three-quarters of F<sub style='font-size: smaller;'>2</sub> flies are normal-winged
Question 20:
Haemophilia results from the mutation of the genes
- A In the sex chromosome
- B Which control skin colour
- C Which control the mechanism for blood-clotting
- D Which control the formation of haemoglobin